tính bằng hai cách (7/9+5/6)x3/5
K
Khách
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SC
2
15 tháng 5 2022
`( 9 xx 6 xx 5 xx 7 )/( 19 xx 7 xx 2 xx 3 )`
`= ( 9 xx 2 xx 3 xx 7 xx 5 )/( 19 xx 7 xx 2 xx 3 )`
`= (9xx5)/19`
`= 45/19`
E
24 tháng 4 2017
A. C1: (6/11 + 5/11) x 3/7 = 1 x 3/7 = 3/7
C2: (6/11 + 5/11) x 3/7 = 6/11 x 3/7 + 5/11 x 3/7 = 18/77 + 15/77 = 3/7
24 tháng 4 2017
a)Cách 1:
(6/11+5/11)x3/7
=11/11x3/7
=1x3/7
=3/7
Cách 2:
(6/11+5/11)x3/7
=6/11x3/7+5/11x3/7
=18/77 + 15/77
=33/77
=3/7 (mink đã rút gọn)
k nhé
30 tháng 4 2022
\(=\dfrac{14+15}{18}\cdot\dfrac{3}{5}=\dfrac{29}{18}\cdot\dfrac{3}{5}=\dfrac{29}{30}\)
MH
1
3 tháng 7 2017
C1 : \(\left(\frac{9}{5}+\frac{3}{2}\right):\frac{7}{6}\)
\(=\frac{33}{10}:\frac{7}{6}\)
\(=\frac{99}{35}\)
C2 :
\(\left(\frac{9}{5}+\frac{3}{2}\right):\frac{7}{6}\)
\(=\frac{9}{5}:\frac{7}{6}+\frac{3}{2}:\frac{7}{6}\)
\(=\frac{54}{35}+\frac{9}{7}\)
\(=\frac{99}{35}\)
~ Chúc học tốt ~
Ai ngang qua xin để lại 1 L - I - K - E
N
3 tháng 7 2017
Cách 1 : \(\left(\frac{9}{5}+\frac{3}{2}\right):\frac{7}{6}=\frac{33}{10}:\frac{7}{6}=\frac{33}{10}x\frac{6}{7}=\frac{99}{35}\)
Cách 2 : \(\left(\frac{9}{5}+\frac{3}{2}\right):\frac{7}{6}=\frac{9}{5}:\frac{7}{6}+\frac{3}{2}:\frac{7}{6}=\frac{9}{5}x\frac{6}{7}+\frac{3}{2}x\frac{6}{7}=\frac{54}{35}+\frac{9}{7}=\frac{99}{35}\)
ND
0
S
5 tháng 3 2017
a) \(\left(\frac{1}{5}+\frac{3}{5}\right)\times\frac{1}{4}\)
\(=\frac{4}{5}\times\frac{1}{4}\)
\(=\frac{4}{20}=\frac{1}{5}\)
\(\left(\frac{1}{5}+\frac{3}{5}\right)\times\frac{1}{4}=\frac{1}{5}\times\frac{1}{4}+\frac{3}{5}\times\frac{1}{4}\)
\(=\frac{1}{20}+\frac{3}{20}\)
\(=\frac{4}{20}=\frac{1}{5}\)
b) \(\left(\frac{7}{9}-\frac{2}{9}\right)\times\frac{3}{2}\)
\(=\frac{5}{9}\times\frac{3}{2}\)
\(=\frac{15}{18}=\frac{5}{6}\)
\(\left(\frac{7}{9}-\frac{2}{9}\right)\times\frac{3}{2}=\frac{7}{9}\times\frac{3}{2}-\frac{2}{9}\times\frac{3}{2}\)
\(=\frac{21}{18}-\frac{6}{18}\)
\(=\frac{15}{18}=\frac{5}{6}\)
c) \(\left(\frac{11}{13}-\frac{9}{13}\right)\times\frac{39}{21}\)
\(=\frac{2}{13}\times\frac{39}{21}\)
\(=\frac{78}{273}=\frac{2}{7}\)
\(\left(\frac{11}{13}-\frac{9}{13}\right)\times\frac{39}{21}=\frac{11}{13}\times\frac{39}{21}-\frac{9}{13}\times\frac{39}{21}\)
\(=\frac{429}{273}-\frac{351}{273}\)
\(=\frac{78}{273}=\frac{2}{7}\)
DV
5 tháng 3 2017
a,\(\left(\frac{1}{5}+\frac{3}{5}\right)x\frac{1}{4}\)
=\(\frac{4}{5}x\frac{1}{4}\)
=\(\frac{4}{20}\)
=\(\frac{1}{5}\)
,\(\left(\frac{1}{5}+\frac{3}{5}\right)x\frac{1}{4}\)
=\(\frac{4}{5}x\frac{1}{4}\)
=\(\frac{4x1}{5x4}\)
=\(\frac{1x1}{5x1}\)
=\(\frac{1}{5}\)
DP
3
6 tháng 8 2015
a, \(\frac{7}{5}+\frac{9}{7}+\frac{6}{5}+\frac{11}{7}\)
C1: \(\frac{94}{35}+\frac{6}{5}+\frac{11}{7}=\frac{136}{35}+\frac{11}{7}=5\frac{16}{35}\)
C2: \(=\left(\frac{7}{5}+\frac{6}{5}\right)+\left(\frac{9}{7}+\frac{11}{7}\right)=\frac{13}{5}+\frac{20}{7}=5\frac{16}{35}\)
b,
C1 : \(\frac{8}{14}+\frac{2}{11}+\frac{12}{14}+\frac{31}{11}=\frac{4}{7}+\frac{2}{11}+\frac{6}{7}+\frac{31}{11}=\frac{58}{77}+\frac{6}{7}+\frac{31}{11}=\frac{124}{77}+\frac{31}{11}=4\frac{3}{7}\)
C2:
\(\frac{4}{7}+\frac{2}{11}+\frac{6}{7}+\frac{31}{11}=\left(\frac{4}{7}+\frac{6}{7}\right)+\left(\frac{2}{11}+\frac{31}{11}\right)=\frac{10}{7}+3=3\frac{10}{7}=4\frac{3}{7}\)
**** cko t nha , xin xin đó
Cách 1:
\(\left(\frac{7}{9}+\frac{5}{6}\right)\times\frac{3}{5}\)
\(=\left(\frac{42}{54}+\frac{45}{54}\right)\times\frac{3}{5}\)
\(=\frac{87}{54}\times\frac{3}{5}\)
\(=\frac{29}{18}\times\frac{3}{5}\)
\(=\frac{87}{90}=\frac{29}{30}\)
Cách 2:
\(\left(\frac{7}{9}+\frac{5}{6}\right)\times\frac{3}{5}\)
\(=\frac{7}{9}\times\frac{3}{5}+\frac{5}{6}\times\frac{3}{5}\)
\(=\frac{21}{45}+\frac{15}{30}\)
\(=\frac{7}{15}+\frac{1}{2}\)
\(=\frac{14}{30}+\frac{15}{30}\)
\(=\frac{29}{30}\)